55361187840 has 832 divisors, whose sum is σ = 215141529600. Its totient is φ = 12138577920.

The previous prime is 55361187809. The next prime is 55361187859. The reversal of 55361187840 is 4878116355.

It is a super-2 number, since 2×55361187840² (a number of 22 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a self number, because there is not a number n which added to its sum of digits gives 55361187840.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 779735005 + ... + 779735075.

Almost surely, 2^55361187840 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 55361187840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (107570764800).

55361187840 is an abundant number, since it is smaller than the sum of its proper divisors (159780341760).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55361187840 is an equidigital number, since it uses as much as digits as its factorization.

55361187840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161 (or 125 counting only the distinct ones).

The product of its (nonzero) digits is 806400, while the sum is 48.

The spelling of 55361187840 in words is "fifty-five billion, three hundred sixty-one million, one hundred eighty-seven thousand, eight hundred forty".